1.gameboy color
emulator:fGB32 f-day preview
status: runs everything I have tried perfectly
2.nes
emulator: little john 0.4
status: runs everything I have tried perfectly
3.Genesis
emulator: DrMD beta 9
status: runs almost everything perfectly. Slower gp32's slow down SLIGHTLY and because of some graphics core or something you can't play certain games such as the shining force games (don't worry, sonic works

)
4.snes
emulator: opensnes9xgp
status: is ok for playing rpgs and a couple other games. has tranceparency issues (which can usually be fixed by messing around with the layers in the menus a bit). not really much fun to play most action games unless you turn the sound of and have a high speed gp32.
5. PCengine
emulator: GPengine 0.4
status: no saves, sometimes has sprite issues (but that could be the roms I use.....). Seems to run full speed, very playable

I would highly recommend it along with a few shooters
6.C64
emulator: frodo
status: I couldn't get it to work right but I think that had to do with the roms I got.... most people say it is great.
7.colecovision
emulator: fCOL32 f-day preview
status: great, I haven't found any problems with it.
8.Sega master system
emulator: fSMS32 first release
status: great, I haven't found any problems with it.
9. Arcade
emulator: MAME 1.5 (I know 1.6 is out but I haven't gotten around to updating)
status: no saves, runs nearly full speed for everything I have tried. The sound is good but sometimes crackles. Version 1.6 is supposed to fix this as well as adding a hi score system.
ports:
1. GPdoom v.10
status: runs doom and doom 2 along with any wad additions to them perfectly.
2. gpQuake
status: runs quake at about 10 frames per second (which is actually very playable). supports saves but I haven't gotten it to work..... but others say it works fine.
3.Scumm
status: runs lucasarts adventure games almost perfectly (although the cursor moves very slowly.....).
4.another world
status: runs great. Simply amazing. And it includes the complete original game.
EDIT: also, f-day is supposed to be coming soon. on f-day ryleh will release 12 full-speed emulators along with their source codes. its going to be f-ing awsome